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Additional Soil Vapor Assessment Work Plan Page 5 CPSA,Lodi,California March 22,2024 The City has performed passive air sampling since 2019 based on the request and approval by the Water Board of the 2019 Indoor Air Work Plan. However, as a comparison of passive and active air sampling results, the City performed an active 24-hour IA test using a SUMMA® canister in June 2022 at the 212 W. Pine St. building and compared it with the passive IA sample data collected from the February 2022 IA sampling event. The results indicated that the active IA samples had higher PCE concentrations than the PCE observed in the passive IA samples. It is CHT's opinion that the passive IA samples have similar results than the active IA samples and are easier to handle and not prone to mechanical malfunctions in the equipment that ca be problematic in the manifold and SUMMA®canisters. However, if the Water Board would prefer that the City now perform active indoor air sampling using SUMMA®canisters, The City will do so in August/September 2024 when it has proposed to do another round of SS sampling. A brief description of the tasks and the methodology recommended in this Work Plan is described below. PRE-FIELD ACTIVITIES Prior to performing the discrete depth soil vapor, PSG, sub-slab, and indoor air sampling, CHT, on behalf of the City, will perform the following pre-field activities— • Obtain permission from building owners: The City will send a letter to the owners of the impacted properties seeking permission to perform ASVA activities at their property. • Obtain an Encroachment Permit: CHT will obtain an encroachment permit from the City to install the soil vapor borings in the public right of way. • Obtain Boring Installation Permits: Obtain the necessary permits from the San Joaquin Department of Environmental Health (SJDEH). • Prepare a Health and Safety Plan (HASP): A Site-specific Health and Safety Plan(HASP) will be prepared and utilized in accordance with 29 CFR 1910.120 and Title 8 California Code of Regulations Section 5192 to address potential hazards at the Site during the proposed field activities. The HASP will be reviewed, signed, and adhered to by all onsite personnel including field staff, subcontractors, and Site visitors during the performance of the fieldwork. The HASP will include project objectives, assessments for potential hazards which may be encountered at the Site and associated with chemicals of potential concern (COPC), personal protective equipment and personnel monitoring, Site organization, and emergency contacts. The HASP will remain on-Site during all fieldwork. • Underground Utility Survey: Prior to initiating drilling activities, CHT will mark the soil vapor borehole and PSG sample locations in white paint and contact Underground Service Alert (USA) at least 72-hours prior to the start of fieldwork. Additionally, a private utility locator will also be retained to search for other on-Site subsurface utilities and/or obstructions that may or may not be marked by USA. 581 MONTEGO TERRACE,SUNNYVALE,CA 94089 TEL:415-424-3009